Two altitude disc's, one on each end of the center section weighing 33,500 pounds each give the OSS mount the ability to rotate the primary mirror from horizon to zenith positions. The flat and radius hydro-static bearing surfaces are precision ground for friction free ultra smooth motion. Very high torque ultra low speed DC drive motor assemblies do the work of positioning and following galaxies far far away.
Altitude disc assembly with Nasmyth optical wheel mounted at center. The thin
part mounted at bottom is the hardened altitude drive motor arch.
This photo shows the contact point of the center section assembly. Notice
the raised rectangular ground surface. Also 3 lock pin receptacle ports.
Mirror cell cooling system mounted on altitude disc.
Forced air ducting to equalize ambient temp throughout OSS.
OSS lock pin actuator
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